[w3c/ServiceWorker] mimetype requirement of service worker importScripts() (#1032)

Currently we require a well-formed mime-type for service worker scripts.  See step 7.7:

https://w3c.github.io/ServiceWorker/#update-algorithm

But `importScripts()` does not have this check:

https://w3c.github.io/ServiceWorker/#importscripts

Should we require a well-formed mime-type on imports?

Note, this is currently a compat problem.  On this site:

https://pwa-directory.appspot.com/

The SW script tries to import:

https://pwa-directory.appspot.com/sw-offline-google-analytics/offline-google-analytics-import.js

Which is served with the headers:

  Content-Type:"text/html"
  X-Content-Type-Options:"nosniff"

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